Lookout-telescope



f A. KNIG.

LOOKOUT TBLESCOPB.

APPLICATION FILED JAN.26, 1912.

Patented Aug. 6, 1912.

UNITED sTATEs PATENT oEEicE ALBERT KNIG, OF JENA, GERMANY, .ASSIGNOR T0 THE FIRM 0F CARL ZEISS, OF JENA., GERMANY.

LOOKOUT-TELESCOPE Specification of Letters Patent.

Application filed .T anuary 126, 1912.

Patented Aug. 6, 1912.

serial No. 673,667.

To' all whom 'it may concern:

Be it known that I, ALBERT KNIG, a citi- AZen of the German Empire, residing at Jena., Germany, h: `e invented a new and useful Lookout-Telescope, of which the following is a speccation.

The invention consists in an improvement in look-out telescopes having a variable distance between objective and ocular, formed as independent structures and carried in their upper part by a stand capable of being lengthened and shortened from below and forming the casing of the telescope between the upper and lower parts of the latter. It has been suggested to use as a stand of this character a telescopic tubular system to be l actuated by rope-tackle or gas pressure.

Such a telescopic stand, however, proves comparatively heavy, as in look-out telescopes of adjustable length even the bottom lens of the upper part of the telescope and consequently even the top t-ube, i. e., the tube of smallest diameter, of the telescopic stand, has to be given a very large cross-measurement. According to the present invention this drawback is obviated by employing as stand instead of a telescopio tubular system a hollow mast capable of being extended and withdrawn, having the same crossmeasurement from top to bottom: a prismatic hollow mast with sides that may be coiled and uncoiled, a so-called Fontana mast, one form of-which is described in the specification of Patent 980,157, and shown in Figures 7 and 8 of that patent.

In the annexed drawing: Fig. 1 is a vertical section through a look-out telescope constructed according to the invention. Fig. 2 is a horizontal section on line 2-2 of 1. Fig. 3 is a vertical section through the lower part of a second constructional form of such a telescope. Fig. 4 is a horizout-a1 section on line 4 4 of Fig. 3.

In the first example, Figs. 1 and 2, a Fontana mast disposed in the ordinary way stands on a pedestal consisting of a turntable a. It has, corresponding to its four sides b, which fit together to form a square cross-section, four Winches@` d. 'Ihe lower part'of the telescope, consisting in the eX- ample chosen of an objective lens e, a re- Heet-in prism f and the two ocular lenses, viz., t e field-lens g and the eye-lens 71., mounted in two independent casings.

is j Of these the easing i disposed within the mast.

comprises objective lens, prism and ieldlens. It is inserted inthe middle, tubular part of the turn-table a: insuch a manner that it can be lifted out, when the mast has been withdrawn. The casing lo of the eyelens h is fitted to the square chair Z, which embraces the lower part of the mast. In this disposition the horizontal arm of the lower part of the telescope belongs to both casings c' and lo and its axis passes through one of the four sides b of the mast. This one lside of the mast is therefore provided with openings bo arranged along it in its longitudinal direction. Their Spacing rep?` resents the intervals between the consecutive steps of different heights, in which the loolr-out `telescope may be used. So as to be l able easily to clean the lens-surfaces adjacent to the side of the mast, the casing 7c is fitted by means of a joint to the chair Z.

The upper part of the telescope is oonstructed .in a similar way to 'the lower one. It comprises an ocular system m a serving as objective and -an objective lens o as well as a reflecting prism p. These optical parts are united in a single casing g, which is inserted removably in the head-piece r of the.

mast. v

In the second example, Figs. 3 and f1, the axis of the horizontal arm of' the lower telescope no longerpasses through a side ofthe mast, as the place, where the sides of the mast are brought together, is disposed above the height of a mans head. In this case therefore the look-out telescope is capable of being used, when its height is being varied, no t step by step, but uninterruptedly. The part l of the casing of the lowerl part ofthe telescope contains the objective lens e and the reflecting prism f and is inserted in the central, tubular part of the turn-table c1. The part la? of the casing contains thetwo ocular lenses q and h and isfiXed to the central tube of the turn-table al. The principal.

parts c and d of the winch have a position differing from that of the equivalent parts in. the first example, and the square chair Z of thc Fontana mast has a somewhat diHerent form.

'I claim: ,L

1. A look-out. telescope comprising a pedestal, two independent optical combinations, a lower ocular one and an upper objective one, the axis of each combination being' broken, a pr1smat1c hollow mast and means mounted on the said pedestal for ceiling and uneoiling' the sides of the said mast from below, the ocular combination being fitted to the pedestal near the bottom end of the mast with its entrance axis lying Within the latter and the objective combination being fixed on the top end of the mast with vits exit axis lying within the latter.

2. A look-out telescope comprising a pedestal, two independent optical combinations, a lower ocular one and an upper objective one, the axis of each combination being.

broken, a prismati'c hollow mast and means mounted on the said pedestal for ceiling` and uncoiling the sides of the said mast from below, the ocular combination being itted to the pedestal near the bottom end of the mast with its entrance axis lying within the lat ter and with its exitaxis lying,l below the plaoe Where the sides of the mast are brought together and the objective combnation beingxed on the top end of the mast with its exit axis lying Within the latter.

ALBERT Koene.

VVVitI-iesses PAUL KRGYER, RICHARD HAHN. 

